Quick upgrade procedure (including command line via SSH):
https://www.cisco.com/c/en/us/support/docs/security/email-security-appliance/118547-technote-esa-00.html
Same problem:
https://supportforums.cisco.com/t5/cisco-user-groups/cisco-ironport-c170-cannot-access-webgui-and-problems-with/m-p/3317855/highlight/false#M194
We also have EOL old product (but it' works fine!), and have some problem :(
Product: Cisco IronPort C150 Messaging Gateway(tm) ApplianceModel: C150Version: 7.5.2-014Build Date: 2012-03-06Install Date: 2012-03-06 23:35:48
I think, cause maybe in ...